Convertible stem/fracture stem

Abstract

A humeral anchor for a shoulder prosthesis is disclosed. The humeral anchor includes a distal portion configured to be anchored in a proximal region of a humerus and a proximal portion, the proximal portion including a proximal face, where the proximal face includes an engagement feature configured to directly couple to a reverse shoulder insert having a concave proximal portion, and wherein the proximal face is further configured to directly couple with an anatomical shoulder insert having a convex proximal portion.

We claim: 
     
         1 . A humeral implant system, comprising:
 a stem sized and configured to be at least partially received within a humerus, the stem including:
 a proximal portion having a hemispherical shape, the proximal portion defining an interior cavity circumscribed by a proximal rim and defining a recess within the interior cavity, wherein the proximal portion is configured to be coupled to either of a reverse insert having a concave proximal surface and an anatomic insert having a convex proximal surface; 
 a metaphyseal portion coupled to and extending from the proximal portion, the metaphyseal portion including a medial portion, a first lateral portion, and a second lateral portion; and 
 a shaft portion coupled to a distal end of the metaphyseal portion. 
   
     
     
         2 . The humeral implant system of  claim 1 , wherein the recess extends through the proximal portion of the stem. 
     
     
         3 . The humeral implant system of  claim 2 , wherein a window is defined between the medial portion, the first lateral portion, and the second lateral portion of the metaphyseal portion. 
     
     
         4 . The humeral implant system of  claim 3 , wherein the window is sized and configured to receive a bone graft therein. 
     
     
         5 . The humeral implant system of  claim 3 , wherein the recess opens to the window. 
     
     
         6 . The humeral implant system of  claim 1 , wherein the medial portion of the metaphyseal portion of the stem defines one or more through holes. 
     
     
         7 . The humeral implant system of  claim 1 , further comprising:
 the reverse insert, the reverse insert including a protrusion sized and configured to be received in the internal cavity defined by the proximal portion of the stem,   wherein an inner periphery of the proximal portion of the stem that defines the internal cavity includes a groove for securing the reverse insert to the stem.   
     
     
         8 . The humeral implant system of  claim 1 , further comprising:
 the anatomic insert, the anatomic insert including a surface configured to abut the peripheral rim of the stem.   
     
     
         9 . The humeral implant system of  claim 8 , wherein the internal cavity defined by the proximal portion of the stem extends from the peripheral rim to a planar base surface. 
     
     
         10 . The humeral implant system of  claim 1 , wherein a plurality of circumferential ridges extend radially into the internal cavity defined by the proximal portion. 
     
     
         11 . The humeral implant of  claim 10 , wherein the plurality of circumferential ridges and a sidewall of the proximal portion that defines the internal cavity are monolithic. 
     
     
         12 . A humeral implant system, comprising;
 a stem, including:
 a proximal portion having a hemispherical shape and a proximal face, the proximal portion defining an interior cavity extending inwardly from the proximal face and bounded by a sidewall, the sidewall including one or more circumferential grooves extending radially inwardly into the interior cavity; 
 a shaft portion defining a longitudinal axis; and 
 a metaphyseal portion disposed between and connecting the proximal portion and the stem portion, the metaphyseal portion including at least three portions extending radially away from the longitudinal axis defined by the shaft portion, the at least three portions including a first portion extending in a medial direction, a second portion extending in a first lateral direction, and a third portion extending a second lateral direction that is different from the first lateral direction 
   wherein the proximal portion of the stem is configured to be coupled to an anatomic articular component and to a reverse articular component.   
     
     
         13 . The humeral implant system of  claim 12 , wherein the internal cavity defined by the proximal portion of the stem is sized and configured to receive at least a portion of the reverse articular component therein. 
     
     
         14 . The humeral implant system of  claim 13 , wherein the proximal portion of the stem defines a recess within the internal cavity for use in coupling the anatomic articular component to the stem. 
     
     
         15 . The humeral implant system of  claim 14 , wherein the at least three portions of the metaphyseal portion collectively define an opening sized and configured to receive a bone graft therein. 
     
     
         16 . The humeral implant system of  claim 15 , wherein the recess defined by the proximal part of the stem extends into the opening. 
     
     
         17 . A humeral implant system, comprising:
 a first articular component, including:
 a first portion including an articular surface; and 
 a first protrusion integrally formed with and extending from the first portion of the first articular component, the first protrusion including at least one locking member; and 
   a stem sized and configured to be received at least partially within a humerus, the stem including:
 a proximal portion having a hemispherical shape and a proximal face, the proximal portion defining an interior cavity extending inwardly from the proximal face and bounded by a sidewall, the sidewall including one or more circumferential grooves extending radially inwardly into the interior cavity, at least one of the one or more circumferential grooves sized and configured to engage the at least one locking member of the first articular component; 
 a shaft portion defining a longitudinal axis; and 
 a metaphyseal portion disposed between and connecting the proximal portion and the stem portion, the metaphyseal portion including at least three portions extending radially away from the longitudinal axis defined by the shaft portion, the at least three portions including a first portion extending in a medial direction, a second portion extending in a first lateral direction, and a third portion extending a second lateral direction that is different from the first lateral direction. 
   
     
     
         18 . The humeral implant system of  claim 17 , wherein a top surface of the first portion of the first articular component is angled relative to a bottom surface of the protrusion of the first articular component. 
     
     
         19 . The humeral implant system of  claim 17 , wherein the proximal portion of the stem defines a recess within the internal cavity, the recess sized and configured to receive a second protrusion for coupling a second articular component to the stem. 
     
     
         20 . The humeral implant system of  claim 19 , wherein the at least three portions of the metaphyseal portion collectively define an opening sized and configured to receive a bone graft therein.